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| J/psi par·ti·cle [ jày sprtik'l, jày ps prtik'l ] (plural J/psi par·ti·cles) |
noun |
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| Definition: |
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subatomic particle: an unstable elementary particle of the meson group. It has a large mass, about 6,000 times that of an electron, and is thought to be formed from charmed quarks.
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